Meaning of cis-

cis-

Pronunciation: [key]
  1. a prefix occurring in loanwords from Latin meaning “on the near side of ” (cisalpine); on this model, used in the formation of compound words (cisatlantic).
  2. a specialization of this denoting a geometric isomer having a pair of identical atoms or groups attached on the same side of two atoms linked by a double bond. Cf. trans- (def. 2).

C.I.S.

Pronunciation: [key]
  1. Commonwealth of Independent States.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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